The 'Deluxe' mattress comprises of a higher density memory foam to offer you a firmer feel. The superior support coupled with the memory foam's temperature-sensitive properties (which cause it to conform to the contours of your body) provides optimum pressure relief which greatly enhances sleep by reducing the pressure around the hips and shoulders whilst keeping the spinal column correctly aligned thus promoting the ideal sleep-posture to relieve neck and back problems. Reacts to body heat and moulds to individual body shape.